Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0ca3aa0dc3772a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 02:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 029b984b8223c9a72d4ba1519f09188a SHA-1: c16980926c78d877b0246407acaac6c334cbb67c SHA-256: af0ca3aa0dc3772a7334f309de03736eb4cdd31eb10c2d92f5684e1ff6e1cdb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or redirection scheme. The PDF structure and embedded links are consistent with attempts to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://adikketiga.com/contents/files/butival.pdf In PDF document text
    • https://bor-diing.com/upload/files/nelelilotixuvezune.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/zaxonimexinibigiwog.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/16694884605.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/zitomogixufewosazagipim.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/de8e6bbc64f2e3e873ed8fd3f5ea1d86/16713701521.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/oo7p8dli8atnri1uvkqakh6ic0/baxobamedovulijudabo.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/62430994364.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/90456025553.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/60700533961.pdfIn PDF document text
    • http://gardatrans.com/content/Files/43761947986.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/nozasuzodajituxelofavu.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/42872315217.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/30881822740.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/951e1c2c6a183cd8483ec7d020884040/difopododabiderasubuzu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/290a36e554c6d4ccd529814e3a1c9e94/89386783547.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/13929970127.pdfIn PDF document text
    • https://eclearusa.com/images/file/doropumumedorale.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/17100821379.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/72453153724.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/runurusaronovubelem.pdfIn PDF document text
    • https://mlspoland.co/files/file/puxitejadevapusif.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/wufolikazogesid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=grand+theft+auto+3+initial+release+datePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 18152 bytes
SHA-256: 22933a1f730e86cec4a934c621d3dca84c025f990db0f81d3862cdc2869ce8be
font_01_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 10760 bytes
SHA-256: 8a2d3cb803a11ccb585ea287c2478bc4c86f1069eee9220efb2c958fb3fc3d57
font_02_sfnt_off0001205d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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